Compare to Aleve Caplets active ingredient. Naproxen Sodium Tablets, 220 mg (Capsule-Shaped Tablets) active ingredient is 220 mg of Naproxen Sodium and it may be used as a pain reliever/fever reducer for adults and children 12 s and over. Naproxen Sodium Tablets, 220 mg (Capsule-Shaped Tablets) are a nonsteroidal anti-inflammatory drug (NSAID) and a gluten free product with strength to last 12 hours.